由于通货膨胀、货币贬值给投资者带来实际收益水平下降的风险属于( )。
A. 经济周期波动风险
B. 购买力风险
C. 利率风险
D. 违约风险
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在数据库系统的三级模式体系结构中,描述数据在数据库中的物理结构或存储方式的模式是______。
The company () a rise in salary for its sales managers, but nothing has happened yet.
A. is promised
B. has been promising
C. is promising
D. promised
Seeing the beautiful scenery, the little boy climbed up the hill ______ himself.
A. despite
B. in spite of
C. despite of
D. out of spite
利用N—S图作为详细设计的描述手段时,常需要用两个盒子:数据盒和______。